Destroy Data.Attoparsec.Parsable; use Data.Default instead

[Lucu.git] / Network / HTTP / Lucu / Resource.hs

diff --git a/Network/HTTP/Lucu/Resource.hs b/Network/HTTP/Lucu/Resource.hs
index ddff647364a4295361379926b5affcff571a7081..1abf14be8e6bc7782d47e97bb3ddda75128b8c3b 100644 (file)
--- a/Network/HTTP/Lucu/Resource.hs
+++ b/Network/HTTP/Lucu/Resource.hs
@@ -1,87 +1,90 @@
 {-# LANGUAGE
 {-# LANGUAGE

-    GeneralizedNewtypeDeriving
+    CPP
+  , BangPatterns
+  , FlexibleContexts
+  , GeneralizedNewtypeDeriving

   , DoAndIfThenElse
   , OverloadedStrings
   , DoAndIfThenElse
   , OverloadedStrings

+  , QuasiQuotes

   , RecordWildCards
   , UnicodeSyntax
   #-}
   , RecordWildCards
   , UnicodeSyntax
   #-}

-{-# OPTIONS_HADDOCK prune #-}
--- |This is the Resource Monad; monadic actions to define the behavior
--- of each resources. The 'Resource' Monad is a kind of 'Prelude.IO'
--- Monad thus it implements 'Control.Monad.Trans.MonadIO' class. It is
--- also a state machine.
+-- |This is the Resource Monad; monadic actions to define a behavior
+-- of resource. The 'Rsrc' Monad is a kind of 'IO' Monad thus it
+-- implements 'MonadIO' class, and it is a state machine as well.

 -- 
 -- Request Processing Flow:
 --
 --   1. A client issues an HTTP request.
 --
 --   2. If the URI of it matches to any resource, the corresponding
 -- 
 -- Request Processing Flow:
 --
 --   1. A client issues an HTTP request.
 --
 --   2. If the URI of it matches to any resource, the corresponding

---      'Resource' Monad starts running on a newly spawned thread.
+--      'Rsrc' Monad starts running on a newly spawned thread.

 --
 --

---   3. The 'Resource' Monad looks at the request header, find (or not
---      find) an entity, receive the request body (if any), decide the
---      response header, and decide the response body. This process
---      will be discussed later.
+--   3. The 'Rsrc' Monad looks at request headers, find (or not find)
+--      an entity, receive the request body (if any), send response
+--      headers, and then send a response body. This process will be
+--      discussed later.

 --
 --

---   4. The 'Resource' Monad and its thread stops running. The client
---      may or may not be sending us the next request at this point.
+--   4. The 'Rsrc' Monad and its thread stops running. The client may
+--      or may not be sending us the next request at this point.

 --
 --

--- 'Resource' Monad takes the following states. The initial state is
+-- 'Rsrc' Monad takes the following states. The initial state is

 -- /Examining Request/ and the final state is /Done/.
 --
 -- /Examining Request/ and the final state is /Done/.
 --

---   [/Examining Request/] In this state, a 'Resource' looks at the
---   request header and thinks about an entity for it. If there is a
---   suitable entity, the 'Resource' tells the system an entity tag
---   and its last modification time ('foundEntity'). If it found no
---   entity, it tells the system so ('foundNoEntity'). In case it is
---   impossible to decide the existence of entity, which is a typical
---   case for POST requests, 'Resource' does nothing in this state.
+--   [/Examining Request/] In this state, a 'Rsrc' looks at the
+--   request header fields and thinks about the corresponding entity
+--   for it. If there is a suitable entity, the 'Rsrc' tells the
+--   system an entity tag and its last modification time
+--   ('foundEntity'). If it found no entity, it tells the system so
+--   ('foundNoEntity'). In case it is impossible to decide the
+--   existence of entity, which is a typical case for POST requests,
+--   'Rsrc' does nothing in this state.

 --
 --

---   [/Getting Body/] A 'Resource' asks the system to receive a
---   request body from client. Before actually reading from the
---   socket, the system sends \"100 Continue\" to the client if need
---   be. When a 'Resource' transits to the next state without
---   receiving all or part of request body, the system still reads it
---   and just throws it away.
+--   [/Receiving Body/] A 'Rsrc' asks the system to receive a request
+--   body from the client. Before actually reading from the socket,
+--   the system sends \"100 Continue\" to the client if need be. When
+--   a 'Rsrc' transits to the next state without receiving all or part
+--   of a request body, the system automatically discards it.

 --
 --

---   [/Deciding Header/] A 'Resource' makes a decision of status code
---   and response header. When it transits to the next state, the
---   system checks the validness of response header and then write
---   them to the socket.
+--   [/Deciding Header/] A 'Rsrc' makes a decision of response status
+--   code and header fields. When it transits to the next state, the
+--   system validates and completes the header fields and then sends
+--   them to the client.

 --
 --

---   [/Deciding Body/] In this state, a 'Resource' asks the system to
---   write some response body to the socket. When it transits to the
---   next state without writing any response body, the system
---   completes it depending on the status code.
+--   [/Sending Body/] In this state, a 'Rsrc' asks the system to write
+--   some response body to the socket. When it transits to the next
+--   state without writing any response body, the system automatically
+--   completes it depending on the status code. (To be exact, such
+--   completion only occurs when the 'Rsrc' transits to this state
+--   without even declaring the \"Content-Type\" header field. See:
+--   'setContentType')

 --
 --

---   [/Done/] Everything is over. A 'Resource' can do nothing for the
---   HTTP interaction anymore.
+--   [/Done/] Everything is over. A 'Rsrc' can do nothing for the HTTP
+--   interaction anymore.

 --
 -- Note that the state transition is one-way: for instance, it is an
 -- error to try to read a request body after writing some
 -- response. This limitation is for efficiency. We don't want to read
 --
 -- Note that the state transition is one-way: for instance, it is an
 -- error to try to read a request body after writing some
 -- response. This limitation is for efficiency. We don't want to read

--- the entire request before starting 'Resource', nor we don't want to
--- postpone writing the entire response till the end of 'Resource'
+-- the entire request before starting 'Rsrc', nor we don't want to
+-- postpone writing the entire response till the end of 'Rsrc'

 -- computation.
 -- computation.

-

 module Network.HTTP.Lucu.Resource
     (
     -- * Types
 module Network.HTTP.Lucu.Resource
     (
     -- * Types

-      Resource
+      Resource(..)
+    , Rsrc

     , FormData(..)
     , FormData(..)

-    , runRes
-
-    -- * Actions

 
 

-    -- ** Getting request header
-
-    -- |These actions can be computed regardless of the current state,
-    -- and they don't change the state.
+    -- * Getting request header
+    -- |These functions can be called regardless of the current state,
+    -- and they don't change the state of 'Rsrc'.

     , getConfig
     , getRemoteAddr
     , getRemoteAddr'
     , getRemoteHost
     , getConfig
     , getRemoteAddr
     , getRemoteAddr'
     , getRemoteHost

+#if defined(HAVE_SSL)

     , getRemoteCertificate
     , getRemoteCertificate

+#endif

     , getRequest
     , getMethod
     , getRequestURI
     , getRequest
     , getMethod
     , getRequestURI


@@ -96,73 +99,77 @@ module Network.HTTP.Lucu.Resource
     , getContentType
     , getAuthorization
 
     , getContentType
     , getAuthorization
 

-    -- ** Finding an entity
-
-    -- |These actions can be computed only in the /Examining Request/
-    -- state. After the computation, the 'Resource' transits to
-    -- /Getting Body/ state.
+    -- * Finding an entity
+    -- |These functions can be called only in the /Examining Request/
+    -- state. They make the 'Rsrc' transit to the /Receiving Body/
+    -- state.

     , foundEntity
     , foundETag
     , foundTimeStamp
     , foundNoEntity
     , foundEntity
     , foundETag
     , foundTimeStamp
     , foundNoEntity

-
-    -- ** Getting a request body
-
-    -- |Computation of these actions changes the state to /Getting
-    -- Body/.
-    , input
-    , inputChunk
-    , inputForm
-    , defaultLimit
-
-    -- ** Setting response headers
-    
-    -- |Computation of these actions changes the state to /Deciding
-    -- Header/.
+    , foundNoEntity'
+
+    -- * Receiving a request body
+    -- |These functions make the 'Rsrc' transit to the /Receiving
+    -- Body/ state.
+    , getChunk
+    , getChunks
+    , getForm
+
+    -- * Declaring response status and header fields
+    -- |These functions can be called at any time before transiting to
+    -- the /Sending Body/ state, but they themselves never causes any
+    -- state transitions.

     , setStatus
     , setStatus

-    , setHeader

     , redirect
     , setContentType
     , redirect
     , setContentType

-    , setLocation

     , setContentEncoding
     , setWWWAuthenticate
 
     , setContentEncoding
     , setWWWAuthenticate
 

-    -- ** Writing a response body
+    -- ** Less frequently used functions
+    , setLocation
+    , setHeader
+    , deleteHeader
+
+    -- * Sending a response body

 
 

-    -- |Computation of these actions changes the state to /Deciding
-    -- Body/.
+    -- |These functions make the 'Rsrc' transit to the /Sending Body/
+    -- state.

     , putChunk
     , putChunk

+    , putChunks

     , putBuilder
     , putBuilder

-
-    , driftTo -- private

     )
     where
 import Blaze.ByteString.Builder (Builder)
     )
     where
 import Blaze.ByteString.Builder (Builder)

-import qualified Blaze.ByteString.Builder.ByteString as BB
+import qualified Blaze.ByteString.Builder as BB
+import qualified Blaze.ByteString.Builder.Internal as BB

 import Control.Applicative
 import Control.Applicative

-import Control.Concurrent.STM
-import Control.Monad.Reader
+import Control.Arrow
+import Control.Monad
+import Control.Monad.IO.Class

 import Control.Monad.Unicode
 import Control.Monad.Unicode

-import Data.Ascii (Ascii, CIAscii)
-import qualified Data.Ascii as A
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
+import Data.Attempt

 import qualified Data.Attoparsec.Char8 as P
 import qualified Data.Attoparsec.Char8 as P

-import qualified Data.Attoparsec.Lazy  as LP

 import Data.ByteString (ByteString)
 import qualified Data.ByteString as Strict
 import qualified Data.ByteString.Lazy as Lazy
 import Data.ByteString (ByteString)
 import qualified Data.ByteString as Strict
 import qualified Data.ByteString.Lazy as Lazy

-import Data.Foldable (toList)
-import Data.List
-import qualified Data.Map as M
+import Data.Collections
+import Data.Convertible.Base
+import Data.Convertible.Instances.Text ()
+import Data.Convertible.Utils
+import Data.Default
+import Data.List (intersperse, sort)

 import Data.Maybe
 import Data.Maybe

+import Data.Monoid

 import Data.Monoid.Unicode
 import Data.Monoid.Unicode

-import Data.Sequence (Seq)
+import Data.Proxy
+import Data.Tagged

 import Data.Text (Text)
 import Data.Text (Text)

-import qualified Data.Text as T
-import qualified Data.Text.Encoding as T

 import Data.Time
 import Data.Time

-import qualified Data.Time.HTTP as HTTP
+import Data.Time.Format.HTTP

 import Network.HTTP.Lucu.Abortion
 import Network.HTTP.Lucu.Abortion

-import Network.HTTP.Lucu.Authorization
+import Network.HTTP.Lucu.Authentication

 import Network.HTTP.Lucu.Config
 import Network.HTTP.Lucu.ContentCoding
 import Network.HTTP.Lucu.ETag
 import Network.HTTP.Lucu.Config
 import Network.HTTP.Lucu.ContentCoding
 import Network.HTTP.Lucu.ETag


@@ -170,175 +177,102 @@ import qualified Network.HTTP.Lucu.Headers as H
 import Network.HTTP.Lucu.HttpVersion
 import Network.HTTP.Lucu.Interaction
 import Network.HTTP.Lucu.MultipartForm
 import Network.HTTP.Lucu.HttpVersion
 import Network.HTTP.Lucu.Interaction
 import Network.HTTP.Lucu.MultipartForm

-import Network.HTTP.Lucu.Postprocess
+import Network.HTTP.Lucu.Parser

 import Network.HTTP.Lucu.Request
 import Network.HTTP.Lucu.Request

+import Network.HTTP.Lucu.Resource.Internal

 import Network.HTTP.Lucu.Response
 import Network.HTTP.Lucu.MIMEType
 import Network.HTTP.Lucu.Utils
 import Network.Socket hiding (accept)
 import Network.URI hiding (path)
 import Network.HTTP.Lucu.Response
 import Network.HTTP.Lucu.MIMEType
 import Network.HTTP.Lucu.Utils
 import Network.Socket hiding (accept)
 import Network.URI hiding (path)

-import OpenSSL.X509
+import Prelude hiding (any, drop, lookup, reverse)

 import Prelude.Unicode
 
 import Prelude.Unicode
 

--- |The 'Resource' monad. This monad implements 'MonadIO' so it can do
--- any 'IO' actions.
-newtype Resource a
-    = Resource {
-        unRes ∷ ReaderT Interaction IO a
-      }
-    deriving (Applicative, Functor, Monad, MonadIO)
-
-runRes ∷ Resource a → Interaction → IO a
-runRes r itr
-    = runReaderT (unRes r) itr
-
-getInteraction ∷ Resource Interaction
-getInteraction = Resource ask
-
--- |Get the 'Config' value which is used for the httpd.
-getConfig ∷ Resource Config
-getConfig = itrConfig <$> getInteraction
-
--- |Get the 'SockAddr' of the remote host. If you want a string
--- representation instead of 'SockAddr', use 'getRemoteAddr''.
-getRemoteAddr ∷ Resource SockAddr
-getRemoteAddr = itrRemoteAddr <$> getInteraction
-

 -- |Get the string representation of the address of remote host. If
 -- |Get the string representation of the address of remote host. If

--- you want a 'SockAddr' instead of 'String', use 'getRemoteAddr'.
-getRemoteAddr' ∷ Resource HostName
-getRemoteAddr'
-    = do sa          ← getRemoteAddr
-         (Just a, _) ← liftIO $ getNameInfo [NI_NUMERICHOST] True False sa
-         return a
+-- you want a 'SockAddr' instead of 'HostName', use 'getRemoteAddr'.
+getRemoteAddr' ∷ Rsrc HostName
+getRemoteAddr' = liftIO ∘ toNM =≪ getRemoteAddr
+    where
+      toNM ∷ SockAddr → IO HostName
+      toNM = (fromJust ∘ fst <$>) ∘ getNameInfo [NI_NUMERICHOST] True False

 
 -- |Resolve an address to the remote host.
 
 -- |Resolve an address to the remote host.

-getRemoteHost ∷ Resource (Maybe HostName)
-getRemoteHost
-    = do sa ← getRemoteAddr
-         fst <$> (liftIO $ getNameInfo [] True False sa)
-
--- | Return the X.509 certificate of the client, or 'Nothing' if:
---
---   * This request didn't came through an SSL stream.
---
---   * The client didn't send us its certificate.
---
---   * The 'OpenSSL.Session.VerificationMode' of
---   'OpenSSL.Session.SSLContext' in 'SSLConfig' has not been set to
---   'OpenSSL.Session.VerifyPeer'.
-getRemoteCertificate ∷ Resource (Maybe X509)
-getRemoteCertificate = itrRemoteCert <$> getInteraction
-
--- |Get the 'Request' value which represents the request header. In
--- general you don't have to use this action.
-getRequest ∷ Resource Request
-getRequest = (fromJust ∘ itrRequest) <$> getInteraction
+getRemoteHost ∷ Rsrc (Maybe HostName)
+getRemoteHost = liftIO ∘ getHN =≪ getRemoteAddr
+    where
+      getHN ∷ SockAddr → IO (Maybe HostName)
+      getHN = (fst <$>) ∘ getNameInfo [] True False

 
 -- |Get the 'Method' value of the request.
 
 -- |Get the 'Method' value of the request.

-getMethod ∷ Resource Method
+getMethod ∷ Rsrc Method

 getMethod = reqMethod <$> getRequest
 
 -- |Get the URI of the request.
 getMethod = reqMethod <$> getRequest
 
 -- |Get the URI of the request.

-getRequestURI ∷ Resource URI
+getRequestURI ∷ Rsrc URI

 getRequestURI = reqURI <$> getRequest
 
 -- |Get the HTTP version of the request.
 getRequestURI = reqURI <$> getRequest
 
 -- |Get the HTTP version of the request.

-getRequestVersion ∷ Resource HttpVersion
+getRequestVersion ∷ Rsrc HttpVersion

 getRequestVersion = reqVersion <$> getRequest
 
 getRequestVersion = reqVersion <$> getRequest
 

--- |Get the path of this 'Resource' (to be exact,
--- 'Network.HTTP.Lucu.Resource.Tree.ResourceDef') in the
--- 'Network.HTTP.Lucu.Resource.Tree.ResTree'. The result of this
--- action is the exact path in the tree even when the
--- 'Network.HTTP.Lucu.Resource.Tree.ResourceDef' is greedy.
---
--- Example:
---
--- > main = let tree = mkResTree [ (["foo"], resFoo) ]
--- >        in runHttpd defaultConfig tree
--- >
--- > resFoo = ResourceDef {
--- >     resIsGreedy = True
--- >   , resGet = Just $ do requestURI   <- getRequestURI
--- >                        resourcePath <- getResourcePath
--- >                        pathInfo     <- getPathInfo
--- >                        -- uriPath requestURI == "/foo/bar/baz"
--- >                        -- resourcePath       == ["foo"]
--- >                        -- pathInfo           == ["bar", "baz"]
--- >                        ...
--- >   , ...
--- >   }
-getResourcePath ∷ Resource [Text]
-getResourcePath = (fromJust ∘ itrResourcePath) <$> getInteraction
-
--- |This is an analogy of CGI PATH_INFO. The result is
--- URI-unescaped. It is always @[]@ if the
--- 'Network.HTTP.Lucu.Resource.Tree.ResourceDef' is not greedy. See
+-- |This is an analogy of CGI PATH_INFO. 'getPathInfo' always returns
+-- @[]@ if the corresponding 'Resource' is not greedy. See

 -- 'getResourcePath'.
 --
 -- 'getResourcePath'.
 --

--- Note that the returned path is URI-decoded and then UTF-8 decoded.
-getPathInfo ∷ Resource [Text]
+-- Note that the returned path components are URI-decoded.
+getPathInfo ∷ Rsrc [Strict.ByteString]

 getPathInfo = do rsrcPath ← getResourcePath
 getPathInfo = do rsrcPath ← getResourcePath

-                 reqPath  ← splitPathInfo <$> getRequestURI
-                 -- rsrcPath と reqPath の共通する先頭部分を reqPath か
-                 -- ら全部取り除くと、それは PATH_INFO のやうなものにな
-                 -- る。rsrcPath は全部一致してゐるに決まってゐる（でな
-                 -- ければこの Resource が撰ばれた筈が無い）ので、
-                 -- rsrcPath の長さの分だけ削除すれば良い。
+                 reqPath  ← uriPathSegments <$> getRequestURI

                  return $ drop (length rsrcPath) reqPath
 
 -- |Assume the query part of request URI as
                  return $ drop (length rsrcPath) reqPath
 
 -- |Assume the query part of request URI as

--- application\/x-www-form-urlencoded, and parse it to pairs of
--- @(name, formData)@. This action doesn't parse the request body. See
--- 'inputForm'. Field names are decoded in UTF-8.
-getQueryForm ∷ Resource [(Text, FormData)]
+-- application\/x-www-form-urlencoded, and parse it into pairs of
+-- @(name, formData)@. This function doesn't read the request
+-- body.
+getQueryForm ∷ Rsrc [(Strict.ByteString, FormData)]

 getQueryForm = parse' <$> getRequestURI
     where
       parse' = map toPairWithFormData ∘
                parseWWWFormURLEncoded ∘
 getQueryForm = parse' <$> getRequestURI
     where
       parse' = map toPairWithFormData ∘
                parseWWWFormURLEncoded ∘

-               fromJust ∘
-               A.fromChars ∘
+               convertUnsafe ∘

                drop 1 ∘
                uriQuery
 
                drop 1 ∘
                uriQuery
 

-toPairWithFormData ∷ (ByteString, ByteString) → (Text, FormData)
+toPairWithFormData ∷ (ByteString, ByteString) → (Strict.ByteString, FormData)

 toPairWithFormData (name, value)
     = let fd = FormData {
                  fdFileName = Nothing
 toPairWithFormData (name, value)
     = let fd = FormData {
                  fdFileName = Nothing

+               , fdMIMEType = [mimeType| text/plain |]

                , fdContent  = Lazy.fromChunks [value]
                }
                , fdContent  = Lazy.fromChunks [value]
                }

-      in (T.decodeUtf8 name, fd)
+      in (name, fd)

 
 

--- |Get a value of given request header. Comparison of header name is
--- case-insensitive. Note that this action is not intended to be used
--- so frequently: there should be actions like 'getContentType' for
--- every common headers.
-getHeader ∷ CIAscii → Resource (Maybe Ascii)
+-- |@'getHeader' name@ returns the value of the request header field
+-- @name@. Comparison of header name is case-insensitive. Note that
+-- this function is not intended to be used so frequently: there
+-- should be functions like 'getContentType' for every common headers.
+getHeader ∷ CIAscii → Rsrc (Maybe Ascii)

 getHeader name
     = H.getHeader name <$> getRequest
 
 getHeader name
     = H.getHeader name <$> getRequest
 

--- |Get a list of 'MIMEType' enumerated on header \"Accept\".
-getAccept ∷ Resource [MIMEType]
+-- |Return the list of 'MIMEType' enumerated on the value of request
+-- header \"Accept\", or @[]@ if absent.
+getAccept ∷ Rsrc [MIMEType]

 getAccept
     = do acceptM ← getHeader "Accept"
          case acceptM of
            Nothing
                → return []
            Just accept
 getAccept
     = do acceptM ← getHeader "Accept"
          case acceptM of
            Nothing
                → return []
            Just accept

-               → case P.parseOnly p (A.toByteString accept) of
+               → case P.parseOnly (finishOff def) (cs accept) of

                     Right xs → return xs
                     Right xs → return xs

-                    Left  _  → abort BadRequest []
-                               (Just $ "Unparsable Accept: " ⊕ A.toText accept)
-    where
-      p = do xs ← mimeTypeListP
-             P.endOfInput
-             return xs
-
--- |Get a list of @(contentCoding, qvalue)@ enumerated on header
--- \"Accept-Encoding\". The list is sorted in descending order by
--- qvalue.
-getAcceptEncoding ∷ Resource [(CIAscii, Maybe Double)]
+                    Left  _  → abort $ mkAbortion' BadRequest
+                                     $ "Unparsable Accept: " ⊕ cs accept
+
+-- |Return the list of @(contentCoding, qvalue)@ enumerated on the
+-- value of request header \"Accept-Encoding\". The list is sorted in
+-- descending order by qvalue.
+getAcceptEncoding ∷ Rsrc [(CIAscii, Maybe Double)]

 getAcceptEncoding
     = do accEncM ← getHeader "Accept-Encoding"
          case accEncM of
 getAcceptEncoding
     = do accEncM ← getHeader "Accept-Encoding"
          case accEncM of


@@ -351,584 +285,406 @@ getAcceptEncoding
                     case ver of
                       HttpVersion 1 0 → return [("identity", Nothing)]
                       HttpVersion 1 1 → return [("*"       , Nothing)]
                     case ver of
                       HttpVersion 1 0 → return [("identity", Nothing)]
                       HttpVersion 1 1 → return [("*"       , Nothing)]

-                      _               → abort InternalServerError []
-                                        (Just "getAcceptEncoding: unknown HTTP version")
+                      _               → abort $ mkAbortion' InternalServerError
+                                                "getAcceptEncoding: unknown HTTP version"

            Just ae
                → if ae ≡ "" then
                       -- identity のみが許される。
                       return [("identity", Nothing)]
            Just ae
                → if ae ≡ "" then
                       -- identity のみが許される。
                       return [("identity", Nothing)]

-                  else
-                      case P.parseOnly p (A.toByteString ae) of
-                        Right xs → return $ map toTuple $ reverse $ sort xs
-                        Left  _  → abort BadRequest []
-                                   (Just $ "Unparsable Accept-Encoding: " ⊕ A.toText ae)
+                 else
+                     case P.parseOnly (finishOff def) (cs ae) of
+                       Right xs → return $ map toTuple $ reverse $ sort xs
+                       Left  _  → abort $ mkAbortion' BadRequest
+                                        $ "Unparsable Accept-Encoding: " ⊕ cs ae

     where
     where

-      p = do xs ← acceptEncodingListP
-             P.endOfInput
-             return xs
-

       toTuple (AcceptEncoding {..})
           = (aeEncoding, aeQValue)
 
       toTuple (AcceptEncoding {..})
           = (aeEncoding, aeQValue)
 

--- |Check whether a given content-coding is acceptable.
-isEncodingAcceptable ∷ CIAscii → Resource Bool
-isEncodingAcceptable encoding = any f <$> getAcceptEncoding
+-- |Return 'True' iff a given content-coding is acceptable by the
+-- client.
+isEncodingAcceptable ∷ CIAscii → Rsrc Bool
+isEncodingAcceptable encoding = any doesMatch <$> getAcceptEncoding

     where
     where

-      f (e, q)
-          = (e ≡ "*" ∨ e ≡ encoding) ∧ q ≢ Just 0
+      doesMatch ∷ (CIAscii, Maybe Double) → Bool
+      doesMatch (e, q) = (e ≡ "*" ∨ e ≡ encoding) ∧ q ≢ Just 0

 
 

--- |Get the header \"Content-Type\" as 'MIMEType'.
-getContentType ∷ Resource (Maybe MIMEType)
+-- |Return the value of request header \"Content-Type\" as 'MIMEType'.
+getContentType ∷ Rsrc (Maybe MIMEType)

 getContentType
     = do cTypeM ← getHeader "Content-Type"
          case cTypeM of
            Nothing
                → return Nothing
            Just cType
 getContentType
     = do cTypeM ← getHeader "Content-Type"
          case cTypeM of
            Nothing
                → return Nothing
            Just cType

-               → case P.parseOnly p (A.toByteString cType) of
+               → case P.parseOnly (finishOff def) (cs cType) of

                     Right t → return $ Just t
                     Right t → return $ Just t

-                    Left  _ → abort BadRequest []
-                              (Just $ "Unparsable Content-Type: " ⊕ A.toText cType)
-    where
-      p = do t ← mimeTypeP
-             P.endOfInput
-             return t
+                    Left  _ → abort $ mkAbortion' BadRequest
+                                    $ "Unparsable Content-Type: " ⊕ cs cType

 
 

--- |Get the header \"Authorization\" as 'AuthCredential'.
-getAuthorization ∷ Resource (Maybe AuthCredential)
+-- |Return the value of request header \"Authorization\" as
+-- 'AuthCredential'.
+getAuthorization ∷ Rsrc (Maybe AuthCredential)

 getAuthorization
     = do authM ← getHeader "Authorization"
          case authM of
            Nothing
                → return Nothing
            Just auth
 getAuthorization
     = do authM ← getHeader "Authorization"
          case authM of
            Nothing
                → return Nothing
            Just auth

-               → case P.parseOnly p (A.toByteString auth) of
+               → case P.parseOnly (finishOff def) (cs auth) of

                     Right ac → return $ Just ac
                     Left  _  → return Nothing
                     Right ac → return $ Just ac
                     Left  _  → return Nothing

-    where
-      p = do ac ← authCredentialP
-             P.endOfInput
-             return ac

 
 

-
--- Finding an entity
-
--- |Tell the system that the 'Resource' found an entity for the
--- request URI. If this is a GET or HEAD request, a found entity means
--- a datum to be replied. If this is a PUT or DELETE request, it means
--- a datum which was stored for the URI until now. It is an error to
--- compute 'foundEntity' if this is a POST request.
+-- |Tell the system that the 'Rsrc' found an entity for the request
+-- URI. If this is a GET or HEAD request, a found entity means a datum
+-- to be replied. If this is a PUT or DELETE request, it means a datum
+-- which was stored for the URI until now. For POST requests it raises
+-- an error.

 --
 --

--- Computation of 'foundEntity' performs \"If-Match\" test or
--- \"If-None-Match\" test if possible. When those tests fail, the
--- computation of 'Resource' immediately aborts with status \"412
--- Precondition Failed\" or \"304 Not Modified\" depending on the
--- situation.
+-- 'foundEntity' performs \"If-Match\" test or \"If-None-Match\" test
+-- whenever possible, and if those tests fail, it immediately aborts
+-- with status \"412 Precondition Failed\" or \"304 Not Modified\"
+-- depending on the situation.

 --
 --

--- If this is a GET or HEAD request, 'foundEntity' automatically puts
--- \"ETag\" and \"Last-Modified\" headers into the response.
-foundEntity ∷ ETag → UTCTime → Resource ()
+-- If the request method is either GET or HEAD, 'foundEntity'
+-- automatically puts \"ETag\" and \"Last-Modified\" headers into the
+-- response.
+foundEntity ∷ ETag → UTCTime → Rsrc ()

 foundEntity tag timeStamp
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)
 foundEntity tag timeStamp
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)

-             $ setHeader' "Last-Modified" (HTTP.toAscii timeStamp)
+             $ setHeader "Last-Modified"
+             $ flip proxy http
+             $ cs timeStamp

          when (method ≡ POST)
          when (method ≡ POST)

-             $ abort InternalServerError []
-               (Just "Illegal computation of foundEntity for a POST request.")
+             $ abort
+             $ mkAbortion' InternalServerError
+               "foundEntity: this is a POST request."

          foundETag tag
 
          foundETag tag
 

-         driftTo GettingBody
+         driftTo ReceivingBody

 
 

--- |Tell the system that the 'Resource' found an entity for the
--- request URI. The only difference from 'foundEntity' is that
--- 'foundETag' doesn't (and can't) put \"Last-Modified\" header into
--- the response.
+-- |Tell the system that the 'Rsrc' found an entity for the request
+-- URI. The only difference from 'foundEntity' is that 'foundETag'
+-- doesn't (nor can't) put \"Last-Modified\" header into the response.

 --
 --

--- This action is not preferred. You should use 'foundEntity' whenever
--- possible.
-foundETag ∷ ETag → Resource ()
+-- Using this function is discouraged. You should use 'foundEntity'
+-- whenever possible.
+foundETag ∷ ETag → Rsrc ()

 foundETag tag
     = do driftTo ExaminingRequest
       
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)
 foundETag tag
     = do driftTo ExaminingRequest
       
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)

-              $ setHeader' "ETag"
-              $ A.fromAsciiBuilder
-              $ printETag tag
+             $ setHeader "ETag"
+             $ cs tag

          when (method ≡ POST)
          when (method ≡ POST)

-              $ abort InternalServerError []
-                (Just "Illegal computation of foundETag for POST request.")
+             $ abort
+             $ mkAbortion' InternalServerError
+               "Illegal computation of foundETag for POST request."

 
          -- If-Match があればそれを見る。
          ifMatch ← getHeader "If-Match"
          case ifMatch of
 
          -- If-Match があればそれを見る。
          ifMatch ← getHeader "If-Match"
          case ifMatch of

-           Nothing    → return ()
-           Just value → if value ≡ "*" then
-                            return ()
-                        else
-                            case P.parseOnly p (A.toByteString value) of
-                              Right tags
-                                 -- tags の中に一致するものが無ければ
-                                 -- PreconditionFailed で終了。
-                                 → when ((¬) (any (≡ tag) tags))
-                                       $ abort PreconditionFailed []
-                                         (Just $ "The entity tag doesn't match: " ⊕ A.toText value)
-                              Left _
-                                   → abort BadRequest [] (Just $ "Unparsable If-Match: " ⊕ A.toText value)
+           Nothing
+               → return ()
+           Just value
+               → if value ≡ "*" then
+                      return ()
+                  else
+                      case P.parseOnly (finishOff def) (cs value) of
+                        Right []
+                            → abort $ mkAbortion' BadRequest
+                                    $ "Empty If-Match"
+                        Right tags
+                            -- tags の中に一致するものが無ければ
+                            -- PreconditionFailed で終了。
+                            → when ((¬) (any (≡ tag) tags))
+                                  $ abort
+                                  $ mkAbortion' PreconditionFailed
+                                  $ "The entity tag doesn't match: " ⊕ cs value
+                        Left _
+                            → abort $ mkAbortion' BadRequest
+                                    $ "Unparsable If-Match: " ⊕ cs value

 
          let statusForNoneMatch
                  = if method ≡ GET ∨ method ≡ HEAD then
 
          let statusForNoneMatch
                  = if method ≡ GET ∨ method ≡ HEAD then

-                       NotModified
+                       fromStatusCode NotModified

                    else
                    else

-                       PreconditionFailed
+                       fromStatusCode PreconditionFailed

 
          -- If-None-Match があればそれを見る。
          ifNoneMatch ← getHeader "If-None-Match"
          case ifNoneMatch of
 
          -- If-None-Match があればそれを見る。
          ifNoneMatch ← getHeader "If-None-Match"
          case ifNoneMatch of

-           Nothing    → return ()
-           Just value → if value ≡ "*" then
-                             abort statusForNoneMatch [] (Just "The entity tag matches: *")
-                         else
-                             case P.parseOnly p (A.toByteString value) of
-                               Right tags
-                                   → when (any (≡ tag) tags)
-                                         $ abort statusForNoneMatch []
-                                           (Just $ "The entity tag matches: " ⊕ A.toText value)
-                               Left _
-                                   → abort BadRequest []
-                                     (Just $ "Unparsable If-None-Match: " ⊕ A.toText value)
-
-         driftTo GettingBody
-    where
-      p = do xs ← eTagListP
-             P.endOfInput
-             return xs
-
--- |Tell the system that the 'Resource' found an entity for the
+           Nothing
+               → return ()
+           Just value
+               → if value ≡ "*" then
+                      abort $ mkAbortion' statusForNoneMatch
+                            $ "The entity tag matches: *"
+                  else
+                      case P.parseOnly (finishOff def) (cs value) of
+                        Right []
+                            → abort $ mkAbortion' BadRequest
+                                    $ "Empty If-None-Match"
+                        Right tags
+                            → when (any (≡ tag) tags)
+                                  $ abort
+                                  $ mkAbortion' statusForNoneMatch
+                                  $ "The entity tag matches: " ⊕ cs value
+                        Left _
+                            → abort $ mkAbortion' BadRequest
+                                    $ "Unparsable If-None-Match: " ⊕ cs value
+
+         driftTo ReceivingBody
+
+-- |Tell the system that the 'Rsrc' found an entity for the

 -- request URI. The only difference from 'foundEntity' is that
 -- 'foundTimeStamp' performs \"If-Modified-Since\" test or
 -- \"If-Unmodified-Since\" test instead of \"If-Match\" test or
 -- request URI. The only difference from 'foundEntity' is that
 -- 'foundTimeStamp' performs \"If-Modified-Since\" test or
 -- \"If-Unmodified-Since\" test instead of \"If-Match\" test or

--- \"If-None-Match\" test. Be aware that any tests based on last
+-- \"If-None-Match\" test. Be aware that any tests based on a last

 -- modification time are unsafe because it is possible to mess up such
 -- tests by modifying the entity twice in a second.
 --
 -- modification time are unsafe because it is possible to mess up such
 -- tests by modifying the entity twice in a second.
 --

--- This action is not preferred. You should use 'foundEntity' whenever
--- possible.
-foundTimeStamp ∷ UTCTime → Resource ()
+-- Using this function is discouraged. You should use 'foundEntity'
+-- whenever possible.
+foundTimeStamp ∷ UTCTime → Rsrc ()

 foundTimeStamp timeStamp
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)
 foundTimeStamp timeStamp
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≡ GET ∨ method ≡ HEAD)

-             $ setHeader' "Last-Modified" (HTTP.toAscii timeStamp)
+             $ setHeader "Last-Modified"
+             $ flip proxy http
+             $ cs timeStamp

          when (method ≡ POST)
          when (method ≡ POST)

-             $ abort InternalServerError []
-               (Just "Illegal computation of foundTimeStamp for POST request.")
+             $ abort
+             $ mkAbortion' InternalServerError
+               "Illegal call of foundTimeStamp for POST request."

 
          let statusForIfModSince
                  = if method ≡ GET ∨ method ≡ HEAD then
 
          let statusForIfModSince
                  = if method ≡ GET ∨ method ≡ HEAD then

-                       NotModified
+                       fromStatusCode NotModified

                    else
                    else

-                       PreconditionFailed
+                       fromStatusCode PreconditionFailed

 
 

-         -- If-Modified-Since があればそれを見る。

          ifModSince ← getHeader "If-Modified-Since"
          case ifModSince of
          ifModSince ← getHeader "If-Modified-Since"
          case ifModSince of

-           Just str → case HTTP.fromAscii str of
-                         Right lastTime
+           Just str → case fromAttempt $ ca (Tagged str ∷ Tagged HTTP Ascii) of
+                         Just lastTime

                              → when (timeStamp ≤ lastTime)
                              → when (timeStamp ≤ lastTime)

-                               $ abort statusForIfModSince []
-                                 (Just $ "The entity has not been modified since " ⊕ A.toText str)
-                         Left _
-                             → return () -- 不正な時刻は無視
+                               $ abort
+                               $ mkAbortion' statusForIfModSince
+                               $ "The entity has not been modified since " ⊕ cs str
+                         Nothing
+                             → abort $ mkAbortion' BadRequest
+                                     $ "Malformed If-Modified-Since: " ⊕ cs str

            Nothing  → return ()
 
            Nothing  → return ()
 

-         -- If-Unmodified-Since があればそれを見る。

          ifUnmodSince ← getHeader "If-Unmodified-Since"
          case ifUnmodSince of
          ifUnmodSince ← getHeader "If-Unmodified-Since"
          case ifUnmodSince of

-           Just str → case HTTP.fromAscii str of
-                         Right lastTime
+           Just str → case fromAttempt $ ca (Tagged str ∷ Tagged HTTP Ascii) of
+                         Just lastTime

                              → when (timeStamp > lastTime)
                              → when (timeStamp > lastTime)

-                               $ abort PreconditionFailed []
-                                 (Just $ "The entity has not been modified since " ⊕ A.toText str)
-                         Left _
-                             → return () -- 不正な時刻は無視
+                               $ abort
+                               $ mkAbortion' PreconditionFailed
+                               $ "The entity has not been modified since " ⊕ cs str
+                         Nothing
+                             → abort $ mkAbortion' BadRequest
+                                     $ "Malformed If-Unmodified-Since: " ⊕ cs str

            Nothing  → return ()
 
            Nothing  → return ()
 

-         driftTo GettingBody
+         driftTo ReceivingBody

 
 

--- | Computation of @'foundNoEntity' mStr@ tells the system that the
--- 'Resource' found no entity for the request URI. @mStr@ is an
--- optional error message to be replied to the client.
+-- |@'foundNoEntity' mStr@ tells the system that the 'Rsrc' found no
+-- entity for the request URI. @mStr@ is an optional error message to
+-- be replied to the client.

 --
 --

--- If this is a PUT request, 'foundNoEntity' performs \"If-Match\"
--- test and aborts with status \"412 Precondition Failed\" when it
--- failed. If this is a GET, HEAD, POST or DELETE request,
+-- If the request method is PUT, 'foundNoEntity' performs \"If-Match\"
+-- test and when that fails it aborts with status \"412 Precondition
+-- Failed\". If the request method is GET, HEAD, POST or DELETE,

 -- 'foundNoEntity' always aborts with status \"404 Not Found\".
 -- 'foundNoEntity' always aborts with status \"404 Not Found\".

-foundNoEntity ∷ Maybe Text → Resource ()
+foundNoEntity ∷ Maybe Text → Rsrc ()

 foundNoEntity msgM
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≢ PUT)
 foundNoEntity msgM
     = do driftTo ExaminingRequest
 
          method ← getMethod
          when (method ≢ PUT)

-             $ abort NotFound [] msgM
+             $ abort
+             $ mkAbortion NotFound [] msgM

 
          -- エンティティが存在しないと云ふ事は、"*" も含めたどのやうな
          -- If-Match: 條件も滿たさない。
          ifMatch ← getHeader "If-Match"
          when (ifMatch ≢ Nothing)
 
          -- エンティティが存在しないと云ふ事は、"*" も含めたどのやうな
          -- If-Match: 條件も滿たさない。
          ifMatch ← getHeader "If-Match"
          when (ifMatch ≢ Nothing)

-             $ abort PreconditionFailed [] msgM
-
-         driftTo GettingBody
-
-
--- Getting a request body
-
--- | Computation of @'input' limit@ attempts to read the request body
--- up to @limit@ bytes, and then make the 'Resource' transit to
--- /Deciding Header/ state. When the actual size of body is larger
--- than @limit@ bytes, computation of 'Resource' immediately aborts
--- with status \"413 Request Entity Too Large\". When the request has
--- no body, 'input' returns an empty string.
+             $ abort
+             $ mkAbortion PreconditionFailed [] msgM
+
+         driftTo ReceivingBody
+
+-- |'foundNoEntity'' is the same as @'foundNoEntity' 'Nothing'@.
+foundNoEntity' ∷ Rsrc ()
+{-# INLINE foundNoEntity' #-}
+foundNoEntity' = foundNoEntity Nothing
+
+-- |@'getChunks' limit@ attemts to read the entire request body up to
+-- @limit@ bytes, and then make the 'Rsrc' transit to the /Deciding
+-- Header/ state. When the actual size of the body is larger than
+-- @limit@ bytes, 'getChunks' immediately aborts with status \"413
+-- Request Entity Too Large\". When the request has no body, it
+-- returns an empty string.

 --
 --

--- @limit@ may be less than or equal to zero. In this case, the
--- default limitation value ('cnfMaxEntityLength') is used. See
--- 'defaultLimit'.
+-- When the @limit@ is 'Nothing', 'getChunks' uses the default
+-- limitation value ('cnfMaxEntityLength') instead.

 --
 --

--- 'input' returns a 'Lazy.ByteString' but it's not really lazy:
--- reading from the socket just happens at the computation of 'input',
--- not at the evaluation of the 'Lazy.ByteString'. The same goes for
--- 'inputChunk'.
-input ∷ Int → Resource Lazy.ByteString
-input limit
-    = do driftTo GettingBody
-         itr     ← getInteraction
-         chunk   ← if reqMustHaveBody $ fromJust $ itrRequest itr then
-                       askForInput itr
-                   else
-                       do driftTo DecidingHeader
-                          return (∅)
-         return chunk
-    where
-      askForInput ∷ Interaction → Resource Lazy.ByteString
-      askForInput (Interaction {..})
-          = do let confLimit   = cnfMaxEntityLength itrConfig
-                   actualLimit = if limit ≤ 0 then
-                                     confLimit
-                                 else
-                                     limit
-               when (actualLimit ≤ 0)
-                        $ fail ("inputLBS: limit must be positive: " ⧺ show actualLimit)
-               -- Reader にリクエスト
-               liftIO $ atomically
-                      $ writeTVar itrReqBodyWanted actualLimit
-               -- 應答を待つ。トランザクションを分けなければ當然デッドロックする。
-               chunk ← liftIO $ atomically
-                       $ do chunkLen    ← readTVar itrReceivedBodyLen
-                            chunkIsOver ← readTVar itrReqChunkIsOver
-                            if chunkLen < actualLimit then
-                                -- 要求された量に滿たなくて、まだ殘りが
-                                -- あるなら再試行。
-                                unless chunkIsOver
-                                    $ retry
-                            else
-                                -- 制限値一杯まで讀むやうに指示したのに
-                                -- まだ殘ってゐるなら、それは多過ぎる。
-                                unless chunkIsOver
-                                    $ tooLarge actualLimit
-                            -- 成功。itr 内にチャンクを置いたままにする
-                            -- とメモリの無駄になるので除去。
-                            chunk ← seqToLBS <$> readTVar itrReceivedBody
-                            writeTVar itrReceivedBody    (∅)
-                            writeTVar itrReceivedBodyLen 0
-                            return chunk
-
-               driftTo DecidingHeader
-               return chunk
-
-      tooLarge ∷ Int → STM ()
-      tooLarge lim = abortSTM RequestEntityTooLarge []
-                     (Just $ "Request body must be smaller than "
-                             ⊕ T.pack (show lim) ⊕ " bytes.")
-
-seqToLBS ∷ Seq ByteString → Lazy.ByteString
-{-# INLINE seqToLBS #-}
-seqToLBS = Lazy.fromChunks ∘ toList
-         
--- | Computation of @'inputChunk' limit@ attempts to read a part of
--- request body up to @limit@ bytes. You can read any large request by
--- repeating computation of this action. When you've read all the
--- request body, 'inputChunk' returns an empty string and then make
--- the 'Resource' transit to /Deciding Header/ state.
---
--- @limit@ may be less than or equal to zero. In this case, the
--- default limitation value ('cnfMaxEntityLength') is used. See
--- 'defaultLimit'.
---
--- Note that 'inputChunkLBS' is more efficient than 'inputChunk' so you
--- should use it whenever possible.
-inputChunk ∷ Int → Resource Lazy.ByteString
-inputChunk limit
-    = do driftTo GettingBody
-         itr     ← getInteraction
-         chunk   ← if reqMustHaveBody $ fromJust $ itrRequest itr then
-                       askForInput itr
-                   else
-                       do driftTo DecidingHeader
-                          return (∅)
-         return chunk
+-- 'getChunks' returns a lazy 'Lazy.ByteString' but it's not really
+-- lazy: reading from the socket just happens at the computation of
+-- 'getChunks', not at the evaluation of the 'Lazy.ByteString'.
+getChunks ∷ Maybe Int → Rsrc Lazy.ByteString
+getChunks (Just n)
+    | n < 0     = fail ("getChunks: limit must not be negative: " ⧺ show n)
+    | n ≡ 0     = return (∅)
+    | otherwise = getChunks' n
+getChunks Nothing
+    = getConfig ≫= getChunks ∘ Just ∘ cnfMaxEntityLength
+
+getChunks' ∷ Int → Rsrc Lazy.ByteString
+getChunks' limit = go limit (∅)

     where
     where

-      askForInput ∷ Interaction → Resource Lazy.ByteString
-      askForInput (Interaction {..})
-          = do let confLimit   = cnfMaxEntityLength itrConfig
-                   actualLimit = if limit < 0 then
-                                     confLimit
-                                 else
-                                     limit
-               when (actualLimit ≤ 0)
-                        $ fail ("inputChunkLBS: limit must be positive: " ++ show actualLimit)
-               -- Reader にリクエスト
-               liftIO $ atomically
-                      $ writeTVar itrReqBodyWanted actualLimit
-               -- 應答を待つ。トランザクションを分けなければ當然デッドロック。
-               chunk ← liftIO $ atomically
-                       $ do chunkLen ← readTVar itrReceivedBodyLen
-                            -- 要求された量に滿たなくて、まだ殘りがある
-                            -- なら再試行。
-                            when (chunkLen < actualLimit)
-                                $ do chunkIsOver ← readTVar itrReqChunkIsOver
-                                     unless chunkIsOver
-                                         $ retry
-                            -- 成功
-                            chunk ← seqToLBS <$> readTVar itrReceivedBody
-                            writeTVar itrReceivedBody    (∅)
-                            writeTVar itrReceivedBodyLen 0
-                            return chunk
-               when (Lazy.null chunk)
-                   $ driftTo DecidingHeader
-               return chunk
-
--- | Computation of @'inputForm' limit@ attempts to read the request
--- body with 'input' and parse it as
--- @application\/x-www-form-urlencoded@ or @multipart\/form-data@. If
--- the request header \"Content-Type\" is neither of them, 'inputForm'
--- makes 'Resource' abort with status \"415 Unsupported Media
--- Type\". If the request has no \"Content-Type\", it aborts with
--- \"400 Bad Request\".
+      go ∷ Int → Builder → Rsrc Lazy.ByteString
+      go  0  _ = do chunk ← getChunk 1
+                    if Strict.null chunk then
+                        return (∅)
+                    else
+                        abort $ mkAbortion' RequestEntityTooLarge
+                              $ "Request body must be smaller than "
+                              ⊕ cs (show limit)
+                              ⊕ " bytes."
+      go !n !b = do c ← getChunk $ min n BB.defaultBufferSize
+                    if Strict.null c then
+                        -- Got EOF
+                        return $ BB.toLazyByteString b
+                    else
+                        do let n'  = n - Strict.length c
+                               xs' = b ⊕ BB.fromByteString c
+                           go n' xs'
+
+-- |@'getForm' limit@ attempts to read the request body with
+-- 'getChunks' and parse it as @application\/x-www-form-urlencoded@ or
+-- @multipart\/form-data@. If the request header \"Content-Type\" is
+-- neither of them, 'getForm' aborts with status \"415 Unsupported
+-- Media Type\". If the request has no \"Content-Type\", it aborts
+-- with \"400 Bad Request\".

 --
 --

--- Field names in @multipart\/form-data@ will be precisely decoded in
--- accordance with RFC 2231. On the other hand,
--- @application\/x-www-form-urlencoded@ says nothing about the
--- encoding of field names, so they'll always be decoded in UTF-8.
-inputForm ∷ Int → Resource [(Text, FormData)]
-inputForm limit
+-- Note that there are currently a few limitations on parsing
+-- @multipart/form-data@. See: 'parseMultipartFormData'
+getForm ∷ Maybe Int → Rsrc [(Strict.ByteString, FormData)]
+getForm limit

     = do cTypeM ← getContentType
          case cTypeM of
            Nothing
     = do cTypeM ← getContentType
          case cTypeM of
            Nothing

-               → abort BadRequest [] (Just "Missing Content-Type")
+               → abort $ mkAbortion' BadRequest "Missing Content-Type"

            Just (MIMEType "application" "x-www-form-urlencoded" _)
                → readWWWFormURLEncoded
            Just (MIMEType "multipart" "form-data" params)
                → readMultipartFormData params
            Just cType
            Just (MIMEType "application" "x-www-form-urlencoded" _)
                → readWWWFormURLEncoded
            Just (MIMEType "multipart" "form-data" params)
                → readMultipartFormData params
            Just cType

-               → abort UnsupportedMediaType []
-                 $ Just
-                 $ A.toText
-                 $ A.fromAsciiBuilder
-                 $ A.toAsciiBuilder "Unsupported media type: "
-                 ⊕ printMIMEType cType
+               → abort $ mkAbortion' UnsupportedMediaType
+                       $ cs
+                       $ ("Unsupported media type: " ∷ Ascii)
+                       ⊕ cs cType

     where
       readWWWFormURLEncoded
           = (map toPairWithFormData ∘ parseWWWFormURLEncoded)
             <$>
     where
       readWWWFormURLEncoded
           = (map toPairWithFormData ∘ parseWWWFormURLEncoded)
             <$>

-            (bsToAscii =≪ input limit)
+            (bsToAscii =≪ getChunks limit)

 
       bsToAscii bs
 
       bsToAscii bs

-          = case A.fromByteString (Strict.concat (Lazy.toChunks bs)) of
-              Just a  → return a
-              Nothing → abort BadRequest [] (Just "Malformed x-www-form-urlencoded")
-
-      readMultipartFormData params
-          = do case M.lookup "boundary" params of
-                 Nothing
-                     → abort BadRequest [] (Just "Missing boundary of multipart/form-data")
-                 Just boundary
-                     → do src ← input limit
-                          b   ← case A.fromText boundary of
-                                   Just b  → return b
-                                   Nothing → abort BadRequest []
-                                             (Just $ "Malformed boundary: " ⊕ boundary)
-                          case LP.parse (p b) src of
-                            LP.Done _ formList
-                                → return formList
-                            _   → abort BadRequest [] (Just "Unparsable multipart/form-data")
-          where
-            p b = do xs ← multipartFormP b
-                     P.endOfInput
-                     return xs
-
--- | This is just a constant @-1@. It's better to say @'input'
--- 'defaultLimit'@ than to say @'input' (-1)@ but these are exactly
--- the same.
-defaultLimit ∷ Int
-defaultLimit = (-1)
-
-
--- Setting response headers
-
--- | Set the response status code. If you omit to compute this action,
--- the status code will be defaulted to \"200 OK\".
-setStatus ∷ StatusCode → Resource ()
-setStatus sc
-    = do driftTo DecidingHeader
-         itr ← getInteraction
-         liftIO
-             $ atomically
-             $ setResponseStatus itr sc
-
--- | Set a value of given resource header. Comparison of header name
--- is case-insensitive. Note that this action is not intended to be
--- used so frequently: there should be actions like 'setContentType'
--- for every common headers.
---
--- Some important headers (especially \"Content-Length\" and
--- \"Transfer-Encoding\") may be silently dropped or overwritten by
--- the system not to corrupt the interaction with client at the
--- viewpoint of HTTP protocol layer. For instance, if we are keeping
--- the connection alive, without this process it causes a catastrophe
--- to send a header \"Content-Length: 10\" and actually send a body of
--- 20 bytes long. In this case the client shall only accept the first
--- 10 bytes of response body and thinks that the residual 10 bytes is
--- a part of header of the next response.
-setHeader ∷ CIAscii → Ascii → Resource ()
-setHeader name value
-    = driftTo DecidingHeader ≫ setHeader' name value
-
-setHeader' ∷ CIAscii → Ascii → Resource ()
-setHeader' name value
-    = do itr ← getInteraction
-         liftIO $ atomically
-                $ do res ← readTVar $ itrResponse itr
-                     let res' = H.setHeader name value res
-                     writeTVar (itrResponse itr) res'
-                     when (name ≡ "Content-Type")
-                         $ writeTVar (itrResponseHasCType itr) True
-
--- | Computation of @'redirect' code uri@ sets the response status to
--- @code@ and \"Location\" header to @uri@. The @code@ must satisfy
--- 'isRedirection' or it causes an error.
-redirect ∷ StatusCode → URI → Resource ()
-redirect code uri
-    = do when (code ≡ NotModified ∨ not (isRedirection code))
-             $ abort InternalServerError []
-             $ Just
-             $ A.toText
-             $ A.fromAsciiBuilder
-             $ A.toAsciiBuilder "Attempted to redirect with status "
-             ⊕ printStatusCode code
-         setStatus code
+          = case convertAttemptVia ((⊥) ∷ ByteString) bs of
+              Success a → return a
+              Failure e → abort $ mkAbortion' BadRequest $ cs (show e)
+
+      readMultipartFormData m
+          = case lookup "boundary" m of
+              Nothing
+                  → abort $ mkAbortion' BadRequest "Missing boundary of multipart/form-data"
+              Just boundary
+                  → do src ← getChunks limit
+                       b   ← case ca boundary of
+                                Success b → return b
+                                Failure _ → abort $ mkAbortion' BadRequest
+                                                  $ "Malformed boundary: " ⊕ boundary
+                       case parseMultipartFormData b src of
+                         Right xs → return $ map (first cs) xs
+                         Left err → abort $ mkAbortion' BadRequest $ cs err
+
+-- |@'redirect' code uri@ declares the response status as @code@ and
+-- \"Location\" header field as @uri@. The @code@ must satisfy
+-- 'isRedirection' or it raises an error.
+redirect ∷ StatusCode sc ⇒ sc → URI → Rsrc ()
+redirect sc uri
+    = do when (sc ≈ NotModified ∨ (¬) (isRedirection sc))
+             $ abort
+             $ mkAbortion' InternalServerError
+             $ cs
+             $ ("Attempted to redirect with status " ∷ Ascii)
+             ⊕ cs (fromStatusCode sc)
+         setStatus sc

          setLocation uri
 
          setLocation uri
 

--- | Computation of @'setContentType' mType@ sets the response header
--- \"Content-Type\" to @mType@.
-setContentType ∷ MIMEType → Resource ()
-{-# INLINE setContentType #-}
-setContentType = setHeader "Content-Type" ∘ A.fromAsciiBuilder ∘ printMIMEType
+-- |@'setContentType' mType@ declares the response header
+-- \"Content-Type\" as @mType@. Declaring \"Content-Type\" is
+-- mandatory for sending a response body.
+setContentType ∷ MIMEType → Rsrc ()
+setContentType = setHeader "Content-Type" ∘ cs

 
 

--- | Computation of @'setLocation' uri@ sets the response header
--- \"Location\" to @uri@.
-setLocation ∷ URI → Resource ()
+-- |@'setLocation' uri@ declares the response header \"Location\" as
+-- @uri@. You usually don't need to call this function directly.
+setLocation ∷ URI → Rsrc ()

 setLocation uri
 setLocation uri

-    = case A.fromChars uriStr of
-        Just a  → setHeader "Location" a
-        Nothing → abort InternalServerError []
-                  (Just $ "Malformed URI: " ⊕ T.pack uriStr)
+    = case ca uriStr of
+        Success a → setHeader "Location" a
+        Failure e → abort $ mkAbortion' InternalServerError
+                          $ cs (show e)

     where
       uriStr = uriToString id uri ""
 
     where
       uriStr = uriToString id uri ""
 

--- |Computation of @'setContentEncoding' codings@ sets the response
--- header \"Content-Encoding\" to @codings@.
-setContentEncoding ∷ [CIAscii] → Resource ()
+-- |@'setContentEncoding' codings@ declares the response header
+-- \"Content-Encoding\" as @codings@.
+setContentEncoding ∷ [CIAscii] → Rsrc ()

 setContentEncoding codings
     = do ver ← getRequestVersion
          tr  ← case ver of
                   HttpVersion 1 0 → return (toAB ∘ unnormalizeCoding)
                   HttpVersion 1 1 → return toAB
 setContentEncoding codings
     = do ver ← getRequestVersion
          tr  ← case ver of
                   HttpVersion 1 0 → return (toAB ∘ unnormalizeCoding)
                   HttpVersion 1 1 → return toAB

-                  _               → abort InternalServerError []
-                                    (Just "setContentEncoding: Unknown HTTP version")
+                  _               → abort $ mkAbortion' InternalServerError
+                                            "setContentEncoding: Unknown HTTP version"

          setHeader "Content-Encoding"
          setHeader "Content-Encoding"

-                   (A.fromAsciiBuilder $ joinWith ", " $ map tr codings)
+             $ cs
+             $ mconcat
+             $ intersperse (cs (", " ∷ Ascii))
+             $ map tr codings

     where
     where

-      toAB = A.toAsciiBuilder ∘ A.fromCIAscii
-
--- |Computation of @'setWWWAuthenticate' challenge@ sets the response
--- header \"WWW-Authenticate\" to @challenge@.
-setWWWAuthenticate ∷ AuthChallenge → Resource ()
-setWWWAuthenticate challenge
-    = setHeader "WWW-Authenticate" (printAuthChallenge challenge)
-
-
--- Writing a response body
-
--- | Write a chunk in 'Lazy.ByteString' to the response body. It is
--- safe to apply this function to an infinitely long
--- 'Lazy.ByteString'.
---
--- Note that you must first set the response header \"Content-Type\"
--- before applying this function. See: 'setContentType'
-putChunk ∷ Lazy.ByteString → Resource ()
-{-# INLINE putChunk #-}
-putChunk = putBuilder ∘ BB.fromLazyByteString
-
--- | Run a 'Builder' to construct a chunk, and write it to the
--- response body. It is safe to apply this function to a 'Builder'
--- producing an infinitely long stream of octets.
+      toAB ∷ ConvertSuccess α AsciiBuilder ⇒ α → AsciiBuilder
+      toAB = cs
+
+-- |@'setWWWAuthenticate' challenge@ declares the response header
+-- \"WWW-Authenticate\" as @challenge@.
+setWWWAuthenticate ∷ AuthChallenge → Rsrc ()
+setWWWAuthenticate = setHeader "WWW-Authenticate" ∘ cs
+
+-- |Write a chunk in 'Strict.ByteString' to the response body. You
+-- must first declare the response header \"Content-Type\" before
+-- applying this function. See 'setContentType'.
+putChunk ∷ Strict.ByteString → Rsrc ()
+putChunk = putBuilder ∘ BB.fromByteString
+
+-- |Write a chunk in lazy 'Lazy.ByteString' to the response body. It
+-- can be safely applied to an infinitely long 'Lazy.ByteString'.

 --
 --

--- Note that you must first set the response header \"Content-Type\"
--- before applying this function. See: 'setContentType'
-putBuilder ∷ Builder → Resource ()
-putBuilder b
-    = do itr ← getInteraction
-         liftIO $ atomically
-                $ do driftTo' itr DecidingBody
-                     hasCType ← readTVar $ itrResponseHasCType itr
-                     unless hasCType
-                         $ abortSTM InternalServerError []
-                         $ Just "putBuilder: Content-Type has not been set."
-                     putTMVar (itrBodyToSend itr) b
-
-
--- Private
-
-driftTo ∷ InteractionState → Resource ()
-driftTo newState
-    = do itr ← getInteraction
-         liftIO $ atomically $ driftTo' itr newState
-
-driftTo' ∷ Interaction → InteractionState → STM ()
-driftTo' itr@(Interaction {..}) newState
-    = do oldState ← readTVar itrState
-         if newState < oldState then
-             throwStateError oldState newState
-         else
-             do let a = [oldState .. newState]
-                    b = tail a
-                    c = zip a b
-                mapM_ (uncurry drift) c
-                writeTVar itrState newState
-    where
-      throwStateError ∷ Monad m ⇒ InteractionState → InteractionState → m a
-      throwStateError Done DecidingBody
-          = fail "It makes no sense to output something after finishing outputs."
-      throwStateError old new
-          = fail ("state error: " ⧺ show old ⧺ " ==> " ⧺ show new)
-
-      drift ∷ InteractionState → InteractionState → STM ()
-      drift GettingBody _
-          = writeTVar itrReqBodyWasteAll True
-      drift DecidingHeader _
-          = postprocess itr
-      drift _ _
-          = return ()
+-- Note that you must first declare the response header
+-- \"Content-Type\" before applying this function. See
+-- 'setContentType'.
+putChunks ∷ Lazy.ByteString → Rsrc ()
+putChunks = putBuilder ∘ BB.fromLazyByteString